It's coming out more and more now but a lot of those personality quizzes and "What Game of Thrones character are you" and "What Colour is Your Mood Today" type posts that can tossed around by friends and family are used to collect personal information on you and your friends. It was used by Cambridge Analytica during the last US election and it is coming out more and more how these quizzes are used by phishers to gather personal information on a person over time.